I like it when seemingly disparate topics unexpectedly cross paths. To a certain extent, Egypt's revolution and money have always been interconnected; deteriorating economic prospects for young Egyptians was always a core motivation among the activists I've been writing about, and it's one of those universal grievances that helped draw people into Tahrir Square (and, for that matter, Zuccotti Park).

Meanwhile, as we creep toward publication of The End of Money(February 15!), the mysterious role of cash in both life and the state is, not surprisingly, constantly on my mind. That's what made this photo, posted to Facebook by a friend in Cairo, that much more interesting.

It's an Egyptian banknote, but it has "down with military rule" scribbled on it, in reference to growing public frustration about the policies and practices of the military brass currently running the country. According to my friend, an Egyptian woman wrote this message on a bunch of banknotes, and used them in transactions throughout the day (or maybe days). "It created quite a bit of debate," and generated a lot of positive feedback from people who feel strongly that Egypt's revolution is far from over.